Refers to the inside space of a building, room, vehicle, etc. Often used in compound terms like インテリアデザイン.
The interior of this car is very comfortable.
Abbreviation of インテリアデザイン. Commonly used in contexts like home decoration and styling.
See also: インテリアデザイン
She is really into interior design.
The room got brighter after I changed the living room's interior décor.
She's very particular about interior design and spends a lot of time choosing furniture.
On weekends I enjoy decorating my own room.